FM 21-22 Watermanship 1944-04-25
"The purpose of this manual is three-fold:
a. To give you those basic principles of watermanship that will enable you to meet with confidence any emergency that may arise.
b. To teach you certain fundamental practices used during small landing-craft operations.
under combat conditions.
d. This manual does not describe waterproofing of individual equipment and weapons. Such information is covered in existing manuals and publications of the technical services supplying the equipment. The information included is intended to suggest ways and means rather than to prescribe definite rules. Methods must be modified according to the actual situation."
Digitized by AHEC (U.S. Army Heritage Collections) http://www.carlisle.army.mil/ahec/